$\left(2^d+7^a\right)^2$
$\cos3x=-0.9781$
$\left(7a^2-4\right)\left(7a^2+4\right)$
$\frac{m}{m^{-4}}$
$\int\frac{x+3}{\left(x+2\right)^2}dx$
$18^2+24x$
$\frac{x^2+4+x+6}{x-2}$
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